python: Update build system to ensure dirs.py is created.

Update build system to ensure dirs.py is created when it is a
dependency for a build target. Also, update setup.py to
check for that dependency.

Fixes: 943c4a325045 ("python: set ovs.dirs variables with build system values")
Signed-off-by: Mark Gray <mark.d.gray@redhat.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/python/setup.py b/python/setup.py
index b7252800c..d385d8372 100644
--- a/python/setup.py
+++ b/python/setup.py
@@ -30,6 +30,15 @@ except IOError:
           file=sys.stderr)
     sys.exit(-1)
 
+try:
+    # Try to open generated ovs/dirs.py. However, in this case we
+    # don't need to exec()
+    open("ovs/dirs.py")
+except IOError:
+    print("Ensure dirs.py is created by running make python/ovs/dirs.py",
+          file=sys.stderr)
+    sys.exit(-1)
+
 ext_errors = (CCompilerError, DistutilsExecError, DistutilsPlatformError)
 if sys.platform == 'win32':
     ext_errors += (IOError, ValueError)